Sukkiri-ing/su-killing Arts Strongest yukkuri martial arts are invented by the alice types (after being relentlessly persecuted?) It is the same as human swordsmanship, victory is determined by advance and retreat(forward and back), enter and exit and a fast sukiri(strike) are the three requirements.
The body type is trained on other yukkuri types to achieve the strong and steel like peni-peni and the fast 0.16s sukiri.